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NEW YORK (ETF Expert) -- The 30 companies that comprise the Dow Jones Industrials collectively failed to increase sales in 2013. Yet, the price of the Dow surged more than 25%. While that price appreciation for the big-time benchmark may be slowing, the Dow still managed to eclipse 17000 without generating much in the way of actual revenue growth.

Sales at S&P 500 corporations have also been unimpressive. According to Howard Silverblatt, senior index analyst at S&P Capital IQ, aggregate sales per share for S&P 500 constituents registered $2.49 billion in the first quarter of 2014. Back near the last bear market's inception in Q1 of 2008? $2.65 billion.

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If Silverblatt is correct, one method of measuring revenue strength -- sales per share -- is less vibrant today than during the beginning of the Great Recession.

Of course, analysts keep drilling home the notion that the bull market rests on the trajectory of corporate earnings. The problem with relying on the profitability data alone is the data are being manipulated. Record low interest rates since the end of 2008 have fostered binge borrowing by corporations and the subsequent financing of nearly $2 trillion in stock buybacks (first-quarter 2009 to first-quarter 2014).

The effect? A misguided perception that earnings are barreling forward. In truth, earnings per share appear strong because buybacks reduce the number of shares in existence, artificially reducing the trumpeted price-to-earnings (P/E) ratio.

It is also worth noting that the current price-to-sales (P/S) ratio for the S&P 500 (1.77) is roughly 25% higher than the median P/S in the 21st century (1.42). The historical mean since the market benchmark began? Around 0.9. It follows that most folks can reasonably assume that U.S. stocks are quite expensive in the context of the revenue that corporations have been generating.

The concern led me to identify a handful of broader-based U.S. exchange-traded funds with substantially lower price-to-sales numbers than the S&P 500. The ratios in the table below come from the most recent Morningstar data feed and/or a provider's Web site:

Let's consider WisdomTree Small Cap Earnings (EES) - Get Free Report. Not only is its price-to-sales a better "deal" than the S&P 500, but EES boasts a trailing 12-month P/E that is 12.3% lower than that of the S&P 500 and 24.7% lower than iShares Russell 2000 Small Cap (IWM) - Get Free Report. Sales-per-share might not be the only metric, but perhaps we should not ignore it either.

Some might wonder whether there is any evidence to support whether the sales data even matters. This may be difficult to quantify. However, over the last three years, EES has produced 10 percentage points more than its benchmark competitor.  Perhaps 1,000 basis points is worthy of additional investigation.

EES Versus IWM

What if we bring the 2007-2009 bear market collapse into play? After all, if a potential investment is a bargain, shouldn't it hold up better than its competitors under extreme pressure? Unfortunately, EES did not show a capacity to "lose less" in the bearish collapse. On the other hand, the outperformance by EES over IWM across seven-and-a-half years jumps to 20 percentage (2,000 basis) points.

EES Versus IWM Since 2007

Let's take a look at another example from the table above, RevenueShares Large Cap (RWL) - Get Free Report. This ETF trades close to a 10% P/E discount to the S&P 500, in addition to its formidable P/S bargain.

Unfortunately, RWL did not provide inherent downside protection in the 2007-2009 bear. Yet, one can point to longer-term benefits of fundamental value, including a 15 percentage point (150 basis point) spread above the S&P 500 SPDR Trust (SPY) - Get Free Report in the period investigated.

RWL Versus SPY

In sum, if you are less concerned about extreme depreciation over the shorter term, and you're comfortable with holding-n-hoping over the next decade, lower P/S ETFs show an ability to outperform.

On the other hand, if you're like me, you believe in the importance of protection. My clients certainly want me to minimize damage to account values during a bearish downtrend. That's why I use stop-limit orders and trendlines to raise cash levels in unusually dangerous times. Equally important, I employ hedges and non-correlated assets to lessen the impact of sharp selloffs.

This article represents the opinion of a contributor and not necessarily that of TheStreet or its editorial staff.